> Personally I usually see the opposite effect - people first reach for a too-naive approach and implement some O(n^2) algorithm where it wouldn't have even been more complex to implement something O(n) or O(n log n). And n is almost always small so it works fine, until it blows up spectacularly.

Same. People solve in ways that are very obviously going to cause serious problems in only a few short weeks or months and it’s endlessly frustrating. If you’re building a prototype, fine, but if you’re building for production, very far from fine.

Most frustrating because often there’s next to no cost in selecting and implementing the correct architecture, domain model, data structure, or algorithm up front.